| 1 | MODULE zdfsh2 |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE zdfsh2 *** |
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| 4 | !! Ocean physics: shear production term of TKE |
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| 5 | !!===================================================================== |
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| 6 | !! History : - ! 2014-10 (A. Barthelemy, G. Madec) original code |
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| 7 | !! NEMO 4.0 ! 2017-04 (G. Madec) remove u-,v-pts avm + ready for coarse-grained Open-MP |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! zdf_sh2 : compute mixing the shear production term of TKE |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | USE dom_oce ! domain: ocean |
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| 14 | ! |
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| 15 | USE in_out_manager ! I/O manager |
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| 16 | USE lib_mpp ! MPP library |
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| 17 | USE timing ! Timing |
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| 18 | |
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| 19 | IMPLICIT NONE |
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| 20 | PRIVATE |
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| 21 | |
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| 22 | PUBLIC zdf_sh2 ! called by zdftke, zdfglf, and zdfric |
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| 23 | |
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| 24 | !! * Substitutions |
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| 25 | # include "domain_substitute.h90" |
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| 26 | !!---------------------------------------------------------------------- |
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| 27 | !! NEMO/OPA 4.0 , NEMO Consortium (2017) |
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| 28 | !! $Id: $ |
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| 29 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 30 | !!---------------------------------------------------------------------- |
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| 31 | CONTAINS |
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| 32 | |
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| 33 | SUBROUTINE zdf_sh2( ARG_2D, pub, pvb, pun, pvn, p_avm, p_sh2 ) |
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| 34 | !!---------------------------------------------------------------------- |
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| 35 | !! *** ROUTINE zdf_sh2 *** |
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| 36 | !! |
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| 37 | !! ** Purpose : Compute the shear production term of a TKE equation |
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| 38 | !! |
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| 39 | !! ** Method : - a stable discretization of this term is linked to the |
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| 40 | !! time-space discretization of the vertical diffusion |
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| 41 | !! of the OGCM. NEMO uses C-grid, a leap-frog environment |
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| 42 | !! and an implicit computation of vertical mixing term, |
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| 43 | !! so the shear production at w-point is given by: |
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| 44 | !! sh2 = mi[ mi(avm) * dk[ub]/e3ub * dk[un]/e3un ] |
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| 45 | !! + mj[ mj(avm) * dk[vb]/e3vb * dk[vn]/e3vn ] |
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| 46 | !! NB: wet-point only horizontal averaging of shear |
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| 47 | !! |
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| 48 | !! ** Action : - p_sh2 shear prod. term at w-point (inner domain only) |
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| 49 | !! ***** |
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| 50 | !! References : Bruchard, OM 2002 |
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| 51 | !! --------------------------------------------------------------------- |
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| 52 | INTEGER , INTENT(in ) :: ARG_2D ! inner domain start-end i-indices |
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| 53 | REAL(wp), DIMENSION(:,:,:) , INTENT(in ) :: pub, pvb, pun, pvn ! before, now horizontal velocities |
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| 54 | REAL(wp), DIMENSION(:,:,:) , INTENT(in ) :: p_avm ! vertical eddy viscosity (w-points) |
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| 55 | REAL(wp), DIMENSION(WRK_3D), INTENT( out) :: p_sh2 ! shear production of TKE (w-points) |
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| 56 | ! |
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| 57 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 58 | REAL(wp), DIMENSION(WRK_2De(-1,)) :: zsh2u, zsh2v ! 2D workspace |
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| 59 | !!-------------------------------------------------------------------- |
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| 60 | ! |
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| 61 | IF( nn_timing == 1 ) CALL timing_start('zdf_sh2') |
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| 62 | ! |
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| 63 | DO jk = 2, jpkm1 |
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| 64 | DO jj = k_Jstr-1, k_Jend !* 2 x shear production at uw- and vw-points (energy conserving form) |
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| 65 | DO ji = k_Istr-1, k_Iend |
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| 66 | zsh2u(ji,jj) = ( p_avm(ji+1,jj,jk) + p_avm(ji,jj,jk) ) & |
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| 67 | & * ( pun(ji,jj,jk-1) - pun(ji,jj,jk) ) & |
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| 68 | & * ( pub(ji,jj,jk-1) - pub(ji,jj,jk) ) / ( e3uw_n(ji,jj,jk) * e3uw_b(ji,jj,jk) ) * wumask(ji,jj,jk) |
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| 69 | zsh2v(ji,jj) = ( p_avm(ji,jj+1,jk) + p_avm(ji,jj,jk) ) & |
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| 70 | & * ( pvn(ji,jj,jk-1) - pvn(ji,jj,jk) ) & |
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| 71 | & * ( pvb(ji,jj,jk-1) - pvb(ji,jj,jk) ) / ( e3vw_n(ji,jj,jk) * e3vw_b(ji,jj,jk) ) * wvmask(ji,jj,jk) |
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| 72 | END DO |
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| 73 | END DO |
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| 74 | DO jj = k_Jstr, k_Jend !* shear production at w-point |
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| 75 | DO ji = k_Jstr, k_Iend ! coast mask: =2 at the coast ; =1 otherwise (NB: wmask useless as zsh2 are masked) |
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| 76 | p_sh2(ji,jj,jk) = 0.25 * ( ( zsh2u(ji-1,jj) + zsh2u(ji,jj) ) * ( 2. - umask(ji-1,jj,jk) * umask(ji,jj,jk) ) & |
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| 77 | & + ( zsh2v(ji,jj-1) + zsh2v(ji,jj) ) * ( 2. - vmask(ji,jj-1,jk) * vmask(ji,jj,jk) ) ) |
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| 78 | END DO |
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| 79 | END DO |
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| 80 | END DO |
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| 81 | ! |
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| 82 | IF( nn_timing == 1 ) CALL timing_stop('zdf_sh2') |
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| 83 | ! |
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| 84 | END SUBROUTINE zdf_sh2 |
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| 85 | |
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| 86 | !!====================================================================== |
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| 87 | END MODULE zdfsh2 |
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